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Full bainitic steel frog and manufacturing method thereof

A technology of bainite steel and frogs, which is applied in the field of railway frogs and its manufacturing, to achieve the effect of reducing manufacturing costs and improving weldability

Active Publication Date: 2014-07-23
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These patents and papers, for the post-weld heat treatment of welded joints, are only designed and carried out considering the stress relief of welded joints, and none of the patents and reports adopt the overall heat treatment process technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A full bainitic steel frog, the frog core rail has chemical composition (wt%): 0.34 C, 1.58 Mn, 1.45 Cr, 1.24 Si, 0.59 Al, 0.72 Ni, 0.38 Mo, 0.0014 O, 0.00009 H, 0.008 Ti, 0.0004 B, 0.022 V, 0.005 Nb, 0.005 S and 0.008 P, and the rest is Fe, which is cast and rolled into a square billet with a rectangular section of 180mm×90mm, and the rolling ratio is 7. The bainite steel core rail of this composition is flash-welded with the ordinary U75V steel 60 rail. The specific process parameters for flash welding are: flash speed 3mm / s, upsetting speed 80mm / s, upsetting pressure 40MPa, and material The protruding lengths are equal. After the flash welding of the bainitic steel frog core rail, heat treatment is carried out as a whole. The heat treatment process is as follows: firstly, the whole welded bainitic steel frog core rail is heated to 910°C and kept for 160 minutes for austenitization treatment, and then quenched into 550°C successively. and 310°C salt bath for graded i...

Embodiment 2

[0022]Another full bainitic steel frog, the chemical composition of frog core rail is (wt%): 0.35C, 1.61 Mn, 1.52 Cr, 1.31 Si, 0.67 Al, 0.58 Ni, 0.35 Mo, 0.0015 O, 0.00008 H, 0.008 Ti, 0.0004 B, 0.002 V, 0.001 Nb, 0.009 S and 0.009 P, and the rest is Fe, which is cast and rolled into a billet with a section of 180mm×90mm, and the rolling ratio is 8. The bainitic steel core rail with this composition is flash-welded with the ordinary U75V steel 60 rail. The specific process parameters during flash welding are: flash speed 2.2mm / s, upsetting speed 95mm / s, upsetting pressure 48MPa, and the welding material The protruding lengths are equal. After the flash welding of the bainite steel frog core rail, heat treatment is carried out as a whole. The heat treatment process is as follows: firstly, the whole welded core rail is heated to 940°C and kept for 110 minutes for austenitization treatment, and then quenched into salt baths at 550°C and 330°C successively. Carry out graded isoth...

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Abstract

A fully bainitic steel frog, which mainly includes two different bainitic steels for the core rail and wing rail of the bainitic steel frog, and the material of the core rail is 35MnCrSiAlNiMo bainitic steel, and its O< 0.0015, H<0.0001, Ti<0.01, B<0.0005, V<0.03, Nb<0.01, S<0.01, P<0.01, the material of the wing rail is 23MnCrSiAlNiMo bainitic steel. The front and rear of the bainitic steel frog core rail are two connected sections. The front section is a 35MnCrSiAlNiMo bainite steel core rail, and the rear section is a 60-type U75V steel rail. The two are directly flash welded, and then the overall heat treatment is carried out. The fully bainitic steel frog is obtained by assembling the prepared bainitic steel frog core rail and wing rail. The frog of the present invention has excellent mechanical properties and can significantly increase the service life; although it is a full bainite steel frog, the cost is not high; and there is no strong attenuation of performance after welding of bainite steel and residual stress of welded joints question.

Description

technical field [0001] The invention relates to a railway frog and a manufacturing method thereof. Background technique [0002] Frogs are an important part of the railway, and they are also the most seriously damaged parts. At present, there are two kinds of fixed frogs used on my country's railways: one is the combination frog of bainitic steel core rail and high carbon steel wing rail, which is fastened by bolts, and is usually called assembled bainitic frog. Body steel frog; the other is cast high manganese steel frog, which is integrally formed by casting, usually called high manganese steel whole cast frog. High manganese steel frogs have the advantages of good toughness, bearing hardening, wear resistance, etc., but cast high manganese steel frogs have unavoidable casting defects, such as looseness, shrinkage cavities and too coarse grains, etc., which are easy to cause during operation. Longitudinal and horizontal cracks, vertical cracks, crushing, peeling off block...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/58C21D9/04B23K11/04
Inventor 张福成吕博张明杨志南郑春雷康杰
Owner YANSHAN UNIV